Some more FLEXIBLE_ARRAY_MEMBER fixes.

src/backend/optimizer/plan/setrefs.c

@@ -41,9 +41,8 @@ typedef struct
 	int			num_vars;		/* number of plain Var tlist entries */
 	bool		has_ph_vars;	/* are there PlaceHolderVar entries? */
 	bool		has_non_vars;	/* are there other entries? */
-	/* array of num_vars entries: */
-	tlist_vinfo vars[1];		/* VARIABLE LENGTH ARRAY */
-} indexed_tlist;				/* VARIABLE LENGTH STRUCT */
+	tlist_vinfo vars[FLEXIBLE_ARRAY_MEMBER];	/* has num_vars entries */
+} indexed_tlist;
 
 typedef struct
 {

src/include/access/brin_page.h

@@ -56,7 +56,12 @@ typedef struct BrinMetaPageData
 /* Definitions for revmap pages */
 typedef struct RevmapContents
 {
-	ItemPointerData rm_tids[1]; /* really REVMAP_PAGE_MAXITEMS */
+	/*
+	 * This array will fill all available space on the page.  It should be
+	 * declared [FLEXIBLE_ARRAY_MEMBER], but for some reason you can't do that
+	 * in an otherwise-empty struct.
+	 */
+	ItemPointerData rm_tids[1];
 } RevmapContents;
 
 #define REVMAP_CONTENT_SIZE \

src/include/replication/slot.h

@@ -130,6 +130,10 @@ typedef struct ReplicationSlot
  */
 typedef struct ReplicationSlotCtlData
 {
+	/*
+	 * This array should be declared [FLEXIBLE_ARRAY_MEMBER], but for some
+	 * reason you can't do that in an otherwise-empty struct.
+	 */
 	ReplicationSlot replication_slots[1];
 } ReplicationSlotCtlData;
 

src/interfaces/libpq/fe-exec.c

@@ -892,7 +892,8 @@ pqSaveMessageField(PGresult *res, char code, const char *value)
 
 	pfield = (PGMessageField *)
 		pqResultAlloc(res,
-					  sizeof(PGMessageField) + strlen(value),
+					  offsetof(PGMessageField, contents) +
+					  strlen(value) + 1,
 					  TRUE);
 	if (!pfield)
 		return;					/* out of memory? */

src/interfaces/libpq/libpq-int.h

@@ -145,7 +145,7 @@ typedef struct pgMessageField
 {
 	struct pgMessageField *next;	/* list link */
 	char		code;			/* field code */
-	char		contents[1];	/* field value (VARIABLE LENGTH) */
+	char		contents[FLEXIBLE_ARRAY_MEMBER];		/* value, nul-terminated */
 } PGMessageField;
 
 /* Fields needed for notice handling */

src/pl/plpgsql/src/pl_funcs.c

@@ -97,7 +97,7 @@ plpgsql_ns_additem(int itemtype, int itemno, const char *name)
 	/* first item added must be a label */
 	Assert(ns_top != NULL || itemtype == PLPGSQL_NSTYPE_LABEL);
 
-	nse = palloc(sizeof(PLpgSQL_nsitem) + strlen(name));
+	nse = palloc(offsetof(PLpgSQL_nsitem, name) +strlen(name) + 1);
 	nse->itemtype = itemtype;
 	nse->itemno = itemno;
 	nse->prev = ns_top;

src/pl/plpgsql/src/plpgsql.h

@@ -329,7 +329,7 @@ typedef struct PLpgSQL_nsitem
 	int			itemtype;
 	int			itemno;
 	struct PLpgSQL_nsitem *prev;
-	char		name[1];		/* actually, as long as needed */
+	char		name[FLEXIBLE_ARRAY_MEMBER];	/* nul-terminated string */
 } PLpgSQL_nsitem;